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Cars & Trucks Master
Re: is the charger to be "on" while charging it; then on...
The portable charger should NOTE be connected to a battery while the battery is connected to a vehicle! Charge the battery off the car, then disconnect the charger and put the battery into the vehicle to start it! If the charger is not working check the fuse! If that is ok then probably damaged the circuitry!
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One thing to take into consideration is the age of your battery. In several instances, the older the battery, the less cold cranking amps they have. A trickle charger is good for keeping a battery's voltage charged however that does not really tell you if your battery has a problem. Starters require a lot of amps to turn your engine over. If you have a regular battery charger, put the battery on charge and hopefully the amps will increase. If you get the vehicle started, take it to a battery shop and they can put it on a tester and tell you if you have sufficient cold cranking amps (CCA). They may have to do a full charge on the battery to get the CCA up. If you cannot get your vehicle started and can take it to a battery shop, they can tell you the same thing without it being hooked up to your vehicle. I hope this helps. Once your battery issue is resolved and you are not going to run a vehicle for quite some time, you can keep the vehicle hooked up to a trickle charger (a good one) and your vehicle should start up every time. Be sure to remove it before starting the vehicle or driving.
Hello: Make sure key is off, open hood, on passenger side near inside of of fender you will see the positive and negative connections that go to the battery. (the battery is under the back seat on the passenger side, you might check connections to the battery for excessive corrossion) When checking for corrosion, remove cables from battery, the negative (black) first then the positive (red) Make sure key is off. If no corrosion re-connect battery. Hook up charger under the hood (black lead to black ground point and red to red positive point. then follow directions on your charger. Remember ignition key off.
2 things come to mind. first a trickle charg will take about 8 to 10 hours to fully charge the battery, so you might need to charge it longer to see if the battery takes a full charge. did you try jumping the car with another.
second is it possible the charger was hooked up backwards (pos to neg and vice versa)
Was the car acting the same way before the battery change? Turn on the lights to see if the battery is charged--they should run for ten minutes or so without dimming. If not, charge the battery with an external charger--several hours with a high current charger, overnight with a low current charger. If charging the battery fixes the problem, then measure the battery voltage at the posts with the engine running--you should read 13.5 volts or a little more. If you read 12.6 volts or less, the alternator is likely in trouble. Take the car to AutoZone or similar business for a free check of the charging system. Hope this helps, but if doesn't, check back with us and include any additional symptoms noted plus what you have done to rectify things.
Yes to both questions. the charger must sense 41.5 volts to activate the relay inside the charger. Being a repair shop, I have a charger that is rigged to charge even DEAD batteries. I do not recommend this for the novice. A charger set on 12 volts will bring the batteries back up to 8.2-8.6 volts. A cheap trickle charger may not put out enough to charge a battery of this size. Remember that they are used to MAINTAIN a charge. Connect the Voltmeter and watch for voltage rise. If it rises to 8.1 or above, it is charging. Trojan battery company recommends charging at least once a month.
If the battery is completely dead a trickle charge won't do much. These are designed to keep a good battery good. You need a regular battery charger set to 10 amps for a couple hours then 2 amps overnight. Be aware that sometimes if your battery has been completely killed it may not work for long, that is your car will start but within a few days or hours it will leave you stranded. You'll know because it will drag when you try to start it. Sometimes you get lucky and it works great for years.
Next time do use a trickle charger! Also if the charge you use is automatic then you can leave it hooked up in 2 amp mode when you are gone. Good luck!
once the car is started it runs off the alternator .. so even if your battery is bad the alternator will still run the car .. so it looks lilke your alternator is bad .. when you jumped the car you charged the battery a little but not enough to keep it going since the alternator is not charging . if you hook up a charger overnight then you might be able to run it long enough to get somewhere (garage) .. try to drive when you dont need lights .. those will run down the battery in a short time .. if you have a volt meter then the battery should read about 13.8 to 14.2 volts when the alternator is working properly (car running) .. if it reads lower (like 12volts or less) then the alternator is not charging .. some auto parts stores will test your system free ..